Missing Engine Case Date?

[geunther]

I am sure I am over reacting or missing something but I cannot locate the engine block casting date. I have checked all the places that I can think of and I simply cannot find it. I have checked the entire length side to side near the transmission mount and near the oil filter boss. Other than the 3970010 the only characters there are a K and an 8 in about the same sized font as the casting code. Both are sort of off by themselves.

Is there someplace that I am missing? I cannot fathom that they made an exception for this one engine and put it someplace else or omitted it altogether. I am trying to document the originality of the whole truck and this piece is sort of important.

Block: 3970010
Build Info: K0111TDJ (Ontario, Jan 11, 1972)
Truck Build: January 1972
TH 350: Y2A 20D (72 model year, January 20th, day shift)
Alternator: 2A19 (Jan 19, 1972)